| Tip of the
Month |
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Accelerometer
Health
Measuring an ICP®
sensor's bias voltage is a simple check of
sensor operation that confirms the integrity of the transducer's
electrical circuitry, which includes the sensing crystal. Just
"T" the signal at the signal conditioner input into a scope or meter
and measure the corresponding DC voltage. The result is
typically in the 7 to 12 VDC
range.
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| Proficiency in
Calibration |
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(http://www.modalshop.com/test_calibration.asp?ID=225)
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| Sensor Considerations
in Automotive Modal Analysis for NVH |
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(Adapted from PCB Piezotronics article originally
appearing in Automotive Testing Technology International, May
2008)
 Classical and
operating modal analysis are important tools for understanding and
optimizing dynamic automotive structural behaviors, leading to
stronger and safer automobiles; lighter construction yield; improved
fuel consumption and performance, ride quality, handling, and
NVH. From the measured vibration data and modal analysis,
engineers are able to construct dynamic models of vehicles and
substructures. The dynamic models predict resonant
frequencies, damping values and deflection patterns for each mode of
vibration. Frequency ranges of interest may be sub-one hertz
to a few hertz in terms of ride handling and from 10 hertz to
500 hertz for full vehicle operating data and body-in-white modal
tests.
(http://www.modalshop.com/test_calibration.asp?ID=226) |
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| We appreciate your
interest and are glad to be providing you regular information to
help with your dynamic testing and calibration needs. If you
have any questions you would like answered or have a topic you would
like to see covered, please contact us and we'll be glad to help
out.
Sincerely, |
|
Michael J. Lally The Modal Shop
A PCB Group Company
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Throughout the
past few months, we've discussed various contributors to the 